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Notice: Undefined variable: _SESSION,该如何解决

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2016-06-13 13:33:231164browse

Notice: Undefined variable: _SESSION

PHP code
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-->echo $_SESSION['time']."<br>";

这句话报错。
Notice: Undefined variable: _SESSION 

但是加上赋值就不报错。并且可以显示出aa。
PHP code
<!--

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-->$_SESSION['time'] = 'aa';
echo $_SESSION['time']."<br>";

不知什么原因。


------解决方案--------------------
$_SESSION是在调用session_start()后才被定义的。在这之前,它不是超级全局变量。
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